/**
* gdk_pixbuf_new:
* @colorspace: Color space for image
* @has_alpha: Whether the image should have transparency information
* @bits_per_sample: Number of bits per color sample
* @width: Width of image in pixels, must be > 0
* @height: Height of image in pixels, must be > 0
*
* Creates a new #GdkPixbuf structure and allocates a buffer for it. The
* buffer has an optimal rowstride. Note that the buffer is not cleared;
* you will have to fill it completely yourself.
*
* Return value: (nullable): A newly-created #GdkPixbuf with a reference count of 1, or
* %NULL if not enough memory could be allocated for the image buffer.
**/
GdkPixbuf *
gdk_pixbuf_new (GdkColorspace colorspace,
gboolean has_alpha,
int bits_per_sample,
int width,
int height)
{
guchar *buf;
int rowstride;
rowstride = gdk_pixbuf_calculate_rowstride (colorspace,
has_alpha,
bits_per_sample,
width,
height);
if (rowstride <= 0)
return NULL;
buf = g_try_malloc_n (height, rowstride);
if (!buf)
return NULL;
return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
width, height, rowstride,
free_buffer, NULL);
}
/**
* gdk_pixbuf_new:
* @colorspace: Color space for image
* @has_alpha: Whether the image should have transparency information
* @bits_per_sample: Number of bits per color sample
* @width: Width of image in pixels, must be > 0
* @height: Height of image in pixels, must be > 0
*
* Creates a new #GdkPixbuf structure and allocates a buffer for it. The
* buffer has an optimal rowstride. Note that the buffer is not cleared;
* you will have to fill it completely yourself.
*
* Return value: A newly-created #GdkPixbuf with a reference count of 1, or
* %NULL if not enough memory could be allocated for the image buffer.
**/
GdkPixbuf *
gdk_pixbuf_new (GdkColorspace colorspace,
gboolean has_alpha,
int bits_per_sample,
int width,
int height)
{
guchar *buf;
int channels;
int rowstride;
g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail (bits_per_sample == 8, NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
channels = has_alpha ? 4 : 3;
rowstride = width * channels;
if (rowstride / channels != width || rowstride + 3 < 0) /* overflow */
return NULL;
/* Always align rows to 32-bit boundaries */
rowstride = (rowstride + 3) & ~3;
buf = g_try_malloc_n (height, rowstride);
if (!buf)
return NULL;
return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
width, height, rowstride,
free_buffer, NULL);
}
static gpointer
try_malloc_n (gsize n_blocks, gsize n_block_bytes, GError **error)
{
gpointer ptr = g_try_malloc_n (n_blocks, n_block_bytes);
if (ptr == NULL)
g_set_error_literal (error, G_CONVERT_ERROR, G_CONVERT_ERROR_NO_MEMORY,
_("Failed to allocate memory"));
return ptr;
}
void *g_try_malloc(size_t size)
{
return g_try_malloc_n(1, size);
}
/**
* gdk_pixbuf_from_pixdata:
* @pixdata: a #GdkPixdata to convert into a #GdkPixbuf.
* @copy_pixels: whether to copy raw pixel data; run-length encoded
* pixel data is always copied.
* @error: location to store possible errors.
*
* Converts a #GdkPixdata to a #GdkPixbuf. If @copy_pixels is %TRUE or
* if the pixel data is run-length-encoded, the pixel data is copied into
* newly-allocated memory; otherwise it is reused.
*
* Returns: (transfer full): a new #GdkPixbuf.
* Deprecated: 2.32: Use #GResource instead.
**/
GdkPixbuf*
gdk_pixbuf_from_pixdata (const GdkPixdata *pixdata,
gboolean copy_pixels,
GError **error)
{
guint encoding, bpp;
guint8 *data = NULL;
g_return_val_if_fail (pixdata != NULL, NULL);
g_return_val_if_fail (pixdata->width > 0, NULL);
g_return_val_if_fail (pixdata->height > 0, NULL);
g_return_val_if_fail (pixdata->rowstride >= pixdata->width, NULL);
g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ||
(pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA, NULL);
g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_SAMPLE_WIDTH_MASK) == GDK_PIXDATA_SAMPLE_WIDTH_8, NULL);
g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RAW ||
(pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RLE, NULL);
g_return_val_if_fail (pixdata->pixel_data != NULL, NULL);
bpp = (pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ? 3 : 4;
encoding = pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK;
g_debug ("gdk_pixbuf_from_pixdata() called on:");
g_debug ("\tEncoding %s", encoding == GDK_PIXDATA_ENCODING_RAW ? "raw" : "rle");
g_debug ("\tDimensions: %d x %d", pixdata->width, pixdata->height);
g_debug ("\tRowstride: %d, Length: %d", pixdata->rowstride, pixdata->length);
g_debug ("\tCopy pixels == %s", copy_pixels ? "true" : "false");
if (encoding == GDK_PIXDATA_ENCODING_RLE)
copy_pixels = TRUE;
/* Sanity check the length and dimensions */
if (SIZE_OVERFLOWS (pixdata->height, pixdata->rowstride))
{
g_set_error_literal (error, GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image pixel data corrupt"));
return NULL;
}
if (encoding == GDK_PIXDATA_ENCODING_RAW &&
pixdata->length >= 1 &&
pixdata->length < pixdata->height * pixdata->rowstride - GDK_PIXDATA_HEADER_LENGTH)
{
g_set_error_literal (error, GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image pixel data corrupt"));
return NULL;
}
if (copy_pixels)
{
data = g_try_malloc_n (pixdata->height, pixdata->rowstride);
if (!data)
{
g_set_error (error, GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
g_dngettext(GETTEXT_PACKAGE,
"failed to allocate image buffer of %u byte",
"failed to allocate image buffer of %u bytes",
pixdata->rowstride * pixdata->height),
pixdata->rowstride * pixdata->height);
return NULL;
}
}
if (encoding == GDK_PIXDATA_ENCODING_RLE)
{
const guint8 *rle_buffer = pixdata->pixel_data;
guint8 *rle_buffer_limit = NULL;
guint8 *image_buffer = data;
guint8 *image_limit = data + pixdata->rowstride * pixdata->height;
gboolean check_overrun = FALSE;
if (pixdata->length >= 1)
rle_buffer_limit = pixdata->pixel_data + pixdata->length - GDK_PIXDATA_HEADER_LENGTH;
while (image_buffer < image_limit &&
(rle_buffer_limit != NULL || rle_buffer > rle_buffer_limit))
{
guint length;
if (RLE_OVERRUN(1))
{
check_overrun = TRUE;
break;
}
length = *(rle_buffer++);
if (length & 128)
{
length = length - 128;
check_overrun = image_buffer + length * bpp > image_limit;
if (check_overrun)
length = (image_limit - image_buffer) / bpp;
if (RLE_OVERRUN(bpp < 4 ? 3 : 4))
{
check_overrun = TRUE;
break;
}
if (bpp < 4) /* RGB */
do
{
memcpy (image_buffer, rle_buffer, 3);
image_buffer += 3;
}
while (--length);
else /* RGBA */
do
{
memcpy (image_buffer, rle_buffer, 4);
image_buffer += 4;
}
while (--length);
if (RLE_OVERRUN(bpp))
{
check_overrun = TRUE;
break;
}
rle_buffer += bpp;
}
else
{
length *= bpp;
check_overrun = image_buffer + length > image_limit;
if (check_overrun)
length = image_limit - image_buffer;
if (RLE_OVERRUN(length))
{
check_overrun = TRUE;
break;
}
memcpy (image_buffer, rle_buffer, length);
image_buffer += length;
rle_buffer += length;
}
}
if (check_overrun)
{
g_free (data);
g_set_error_literal (error, GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image pixel data corrupt"));
return NULL;
}
}
else if (copy_pixels)
memcpy (data, pixdata->pixel_data, pixdata->rowstride * pixdata->height);
else
data = pixdata->pixel_data;
return gdk_pixbuf_new_from_data (data, GDK_COLORSPACE_RGB,
(pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA,
8, pixdata->width, pixdata->height, pixdata->rowstride,
copy_pixels ? (GdkPixbufDestroyNotify) g_free : NULL, data);
}
static void
mem_overflow (void)
{
gsize a = G_MAXSIZE / 10 + 10;
gsize b = 10;
gpointer p, q;
typedef char X[10];
#define CHECK_PASS(P) p = (P); g_assert (p == NULL);
#define CHECK_FAIL(P) p = (P); g_assert (p != NULL);
CHECK_PASS (g_try_malloc_n (a, a));
CHECK_PASS (g_try_malloc_n (a, b));
CHECK_PASS (g_try_malloc_n (b, a));
CHECK_FAIL (g_try_malloc_n (b, b));
CHECK_PASS (g_try_malloc0_n (a, a));
CHECK_PASS (g_try_malloc0_n (a, b));
CHECK_PASS (g_try_malloc0_n (b, a));
CHECK_FAIL (g_try_malloc0_n (b, b));
q = g_malloc (1);
CHECK_PASS (g_try_realloc_n (q, a, a));
CHECK_PASS (g_try_realloc_n (q, a, b));
CHECK_PASS (g_try_realloc_n (q, b, a));
CHECK_FAIL (g_try_realloc_n (q, b, b));
free (p);
CHECK_PASS (g_try_new (X, a));
CHECK_FAIL (g_try_new (X, b));
CHECK_PASS (g_try_new0 (X, a));
CHECK_FAIL (g_try_new0 (X, b));
q = g_try_malloc (1);
CHECK_PASS (g_try_renew (X, q, a));
CHECK_FAIL (g_try_renew (X, q, b));
free (p);
#undef CHECK_FAIL
#undef CHECK_PASS
#define CHECK_FAIL(P) if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR)) { p = (P); exit (0); } g_test_trap_assert_failed();
#define CHECK_PASS(P) if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDERR)) { p = (P); exit (0); } g_test_trap_assert_passed();
CHECK_FAIL (g_malloc_n (a, a));
CHECK_FAIL (g_malloc_n (a, b));
CHECK_FAIL (g_malloc_n (b, a));
CHECK_PASS (g_malloc_n (b, b));
CHECK_FAIL (g_malloc0_n (a, a));
CHECK_FAIL (g_malloc0_n (a, b));
CHECK_FAIL (g_malloc0_n (b, a));
CHECK_PASS (g_malloc0_n (b, b));
q = g_malloc (1);
CHECK_FAIL (g_realloc_n (q, a, a));
CHECK_FAIL (g_realloc_n (q, a, b));
CHECK_FAIL (g_realloc_n (q, b, a));
CHECK_PASS (g_realloc_n (q, b, b));
free (q);
CHECK_FAIL (g_new (X, a));
CHECK_PASS (g_new (X, b));
CHECK_FAIL (g_new0 (X, a));
CHECK_PASS (g_new0 (X, b));
q = g_malloc (1);
CHECK_FAIL (g_renew (X, q, a));
CHECK_PASS (g_renew (X, q, b));
free (q);
}
